Composite ringer set



July 24, 1923.

J. F. TOOMEY ET AL COMPOS ITE RINGER- SET Filed Dec.

3l'. 1920 42 Sheets-Sheet 1 hvantom 55% teifu @bho/cm July 24, 1923.

1,462,526 J. F. TOOMEY ET AL COMPOSITE RINGERASET Filed Dec; 51. 1920 2 Sheets-Sheet? Sube/nto@ Patented July 24, 1923.

STATES JOHN F. TOOIVIEY, OF NEW YORK, AND VILLIAI H. HARRISON, OF HOLLIS, NEW YORK,

ASSIGNORS TO AMERICAN TELEPHONE AND TION OF NEW YORK.

TELEGRAPH COMPANY, A CORPORA- OOMPOSITE RINGER SET.

Application led December 31, 1.920. Serial No. 434,279.

To all whom t may concern:

Be it known that we, JOHN F. TooMnY and WILLIAM H. HARRISON, residing at New York and Hollis, in the counties of New York and Queens and State of New York, respectively, have invented certain Improvements in Composite Ringer Sets, of which the followingis a specication.

This invention relates to transmission lines, which include composite ringer devices7 and also to arrangements for testing and adjusting the apparatus of such devices.

It is sometimes the practice, when transmission line is associated with switchboard apparatus, to associate with the line a device known as a composite ringer, the purpose of such a device being to translate the type of signaling current suitable for use over the line and not suitable for use at the switchboard into the type of signaling current suitable for use `at the switchboard and vice versa. For purposes of illustration the type of signaling current suitable for use over the transmission line may be assumed to be of a frequency in the neighborhood of 135 cycles and that suitable for use at the switchboard to be of a frequency in the neighborhood of 16 cycles. The operationcf the composite ringer is controlled primarily by an alternating current relay which responds to the 16 cycle current transmitted from the switchboard and which when operated serves to apply 135 cycle signaling current to the transmission line and an alternating current relay which responds to the 135 cycle current coming in from the transmission line and which when operated serves to apply 16 cycle signaling current to the conductors leading to the switchboard.

In general it is the object of the invention .to provide an improved type of composite ringer and to provide improved arrangements for subjecting the relay arrangements of the composite ringer to tests for observation and adjustment.

It is one of the cardinal fea-tures of the composite ringer of this invention that all of the jacks, which in former arrangements were included directly in the transmission circuit, are eliminated from the transmission circuit so that the arrangement affords less opportunity for interference with the transmission and gives an improvement in the quality of the transmission. Another fea# ture ofthe invention consists in so wiring through jacks the relay, which responds to the 135 cycle signaling current, that it is possible to patch it from oney circuit to another and to pick it up separately for adjustments. A further feature is that the receiving bridge of the composite ringer set is wired through a jack in such a manner that the composite ringer may be picked up for tests and adjustments or may be cut olf entirely from the transmission circuit whenever the ringer is not required. The testing and adjusting circuit of the invention includes arrangements whereby the alternating current relays of the composite ringer may be given both operate and non-operate tests and whereby these relays may be subjected to these tests under actual service conditions and also under what may be termed adjustment conditions. Furthermore means are provided for testing the action of the direct current relays of the composite ringer'. A further feature is that the testing and adjusting circuit is controlled by means of a portable control circuit used in connection with control jacks located near the relays of the composite ringer set. This arrangement makes it possible to control the action of the relays during tests from a position from which they may be observed. In the testing and adjusting circuit there is provided an automatic timing arrangement whereby the impulses of testing current to which the composite ringer relays are subjected may be controlled so as to be of a definite duration. Other features and objects of the invention will appear more fully from the detailed description thereof hereinafter given.

The invention may be more fully understood from the following description together with the accompanying drawing, in the Figures 1 and 2 of which are illustrated a preferred arrangement of the invention. In Fig. 1 is illustrated a circuit diagram of the composite ringer set, while in Fig. 2 is shown the testing and adjusting circuits associated therewith.

In Fig. 1 is illustrated a section of a transmission line including composite ringer apparatus. Section L, of the line leads to switchboard apparatus, while Section L1 of the line constitutes the transmission line itself. Across the talking strands of the transmission line is the bridge comprising conductors 1 and 2. This bridge includes the contacts of jack J1 and includes the windings of the relays 3 and 4. The relay 4 is responsive to ringing current ofthe type suitable for use over the transmission line,whichpforpurposes of illustration will beu hereinafter rreferred to as 135 cycle ringing Current. The relay 3 is responsive to ringing' current of the type suitable for operating ringing apparatus at the switchboard, which for purposes of illustration will hereinafter be referred to as 16 cycle ringing current. The 135 cycle ringing current coming in over the transmission line operatesrelay 4,l which in turn causes 16 cycle ringing current to be applied to section L2 ottheline and thence to the switchboard apparatus. The 16 cycle ringing current originating at the switchboard actuates the relay 3, which in turn controls other relay mechanism to apply 135 cycle ringing current to section L1 ot the transmission line. The operation of the arrangements of the composite ringer is as follows: Normally, the following circuit is closed; lrom ground andbattery 33, contact ot' jack J1, conductor 34, windingv ci" -relay 8, conductor 35, contact oft jaclrd2. conductor 36, contact of jack J3, armature and contact of relay 4` to ground. Accordingly under normal conditions the relay 8 will be maintained in an energized condition by the above traced circuit. Ringing current ot the order oi 135 cycles coming in over section L1 of the line will be transmitted over the bridge, including conductors land 2, and thence over conductors 37 Vand 38, contacts of jack J2, conductors 39 and 40. contacts of jack J3 and the windings et relay 4. This will operate the rrelay 4,I which will -attract its armature and thereby open the previously traced circuit through the windingof relay 8 ,.thereby` deenergizing the relay 8. The deenergization of relay 8 will allow the following circuit to be completed; from ground' .break contact of relay 8, conductor 41,

winding ot relay 9, conductor 42, contact of jack J, to battery 33 and ground. thereby operating the relay 9. The operation of relay 9willcause it to pull :up its armatures and apply to the talking strands of section `L2 oit the line a source ot' 16 cycle ringing current suitable for operating the signaling arrangements at the switchboard. The ringing current originating at the switchboard is transmitted from sect-ion L2 of the line 'i through the bridge, including conductors 1 and 2 and the winding of relay As the relay 3 is adjusted `to operate with. 16 cycle ringing current it will pull up its armature and thereby allow the :following circuit to be completed: from ground and battery 33, contact yot jack J1, conductor 34 through the windings in parallel of relays 5 and V6, conductor 43, contact and armature of relay 3, conductor 44, armature and make contact of relay8 to ground. The closing of this circuit will operate the relays 51and 6. The operation of relay 6 will'connect section L1 `oi the transmission line to the conductors 45, which lead to an interrupter apparatus 7, whereby signaling current `suitalolor use. out over the line, such as 135 .cycle.ringing current, may be generated. The operation ot' relay 5 by the attraction of its upper armature will close .a circuit which will start the interrupter apparatus 7 into operation, and by the attraction otits lower armature. will close a locking circuit over conductor 46 for the relay Sto prevent said relay` from being released, should the relay 4 be accidentally operated at this time. It is pointed out that in the bridge including conductors` 1 and 2 across the transmissiony line, there is also included an arrangement 47 of inductances and condens-nrs, such as 43, so that the transmission characteristics oftherline willnot be materially disturbed lby the composite ringer apparatus andlor 4the purpose of guiding` the different signaling currents to their respective relays. Associated with the bridge including conductors 1 `and 2 `is the jack J 'whereby testing aaparatusmay be associated with the composite. ringer set. It is furthermore pointed out'that by insertingl a dummy plug or a short circuit plug in .this jaclrthat thecompositeringer apparatus may be entirely disconnected from the transmission circuit. Thejack .l3 associated with the relay 4 andlalso the jack J2 are. provided 'for patching p\urp.oses,. so that other relays might be substituted inthecircuit should the relay 4 fail to operateproperly.

n Fig. Qnre illustrated arrangements for testing and adjusting the relays` of the composite. ringer circuit illustratedA in Fig. 1.. TiVith the arrangements of Fig. 2 either et' the alternating current relayssuch asf?) or 4 may be given the, ordinary routine tests to see whether 4they operate or do not operate correctly. These relays may furthermore be given tests under what are known as adjustmentconditions, or in other words. to test their operation under conditions more severe than would be'encountered in actual service. Furtheiunore,` the direct current relays ot the` composite ringer vset may also be tested with the arrangements ot Fig. 2. to seeif they are functioning with the proper amount ofcurrent. The arrangements of Fig. 2 may best be understood from the 'following description of the'. various testing operations.

To test the relay 3 which as hasbeen pointed out, is adjusted to operatewith the 16 cycle signa-ling current transmit-ted Jfrom the switchboard, .the plug P, should be inserted in the .jaclridr1 and the plugs P2`-and l)5 should be inserted in the jacks J4 and lT21 respectively. llVhen the plug P, is inserted in the jack J1 the battery 33 which for pointed out.

merly supplied current for the direct current relays such as 5, 6, 8,4 and 9is disconnected therefrom, andcurrent is now supplied for these relays from the testing apparatus of Fig. 2 in the following manner: it, circuit isclosed from ground, sleeve contacts of jack J5 and plug P4, cont-act of key L, sleeve contacts of plug P5 and ack J5, wind ing of relay 25 to battery and ground. rlhis will operate relay 25 and battery will then be applied to thefollowing circuit: from ground and battery, armature and contact of relay 25, conductor 50, contact of key K5, through the potentiometer 26, Contact o1 key l, throughthe ainmeter 27, conductor 51, sleeve contacts lof plug P1 and jack J1, to conductor 34 and thence to the direct current rela-ys in the same manner as previously u The key K1 will now be, operated and the following circuit will be closed: from ground,` sleeve contacts of jack J 4 and plug P5, resistance 29, contact of key K1, tip contacts of plugP,t and jack J5, tip conductorof jack J4, through the windings of relays 14 and i3, to' hatteryand ground. Theclosing of this circuit will operate the relay 14 but as the vcircuit iiicludes ythe resistance element 29, the relay 13 which is marginal, willnot be operated. lll/lien the plugs P4 and P5 are inserted in the jacks J5 andiJ5, the relay 24 will be operated over the following circuit: from ground to battery, winding of `relay 24 ring contact-s of jackJ5 and plug P5, conitact of key K5,sleeve contacts of jack J 4,and

plug P,1 to ground.` Accordingly whenV the plugs P4 and P5 are inserted in jacks J 4 and J5 andthe key K, isthrown the relays 24 and 25l and 14 will be operated. The relay 24` will p-ullnup` its armature and apply ground to conductor 52 to the junction point for purposes which will now be pointed out. The relay 14 will now he locked up as follows: from ground and battei'y, winding I of relays 1 8 and 14, upper make contact and armature of relay 14,v resistance 29', conductor l59, to junction point 30, and ground, lt is pointed out that this locking circuit will ynot operate marginal relay 13 as it includes awresistance 29, similar to the aforementioned resistance 29. The operation of relay 14 will close the following circuit: from ground and battery, winding` of relay 17, conductor 53, make contactI and armature ofrelay 14, conductor 54, Contact and armature of relay 19 to the uiiction point 30 and thence to ground. This will operate relay 1'? which will connect to the tip and ring Y, conductors of the testing circuit a source of f 16 cycle ringing current which will then be applied over the contacts ofvjack J1 to the bridge, includingthe relay 3. lt is pointed out that in the tip and ring conductors of the testing circuit are included resistance 4elements such as Rhin series-with said conductors and resistance elements such :is it, in bridge across said conductors. These re sistance elements are so adjusted and arranged that under the above described relay operation the 16 cycle ringing current trans mitted to the relay 3 of the composite ringer will be of the corre-ft `value under which said relay should operate. accordingly, the test man, by operating the key lil, may observe whether the relay 3 is operating when current or" the correct value is transii'iitted thereto. rPhe arrangements of the testing circuit include nieans whereby theiringing inn pulse thus sent out to the composite ringer may be regulated to be of a definite duration. These arrangements are as follows. Upon the aforementioned operation of relay 14 the following circuit will be closed: from ground and battery, winding of the stepping magnet 20, conductor armature and contact of relay 19, lower Contact and arniature ot` relay 14, conductor 56, interruptor 23 to ground. The closing ot' this-circuit will start the stepping magnet 2O in op eration.l rlhe stepping magnet 20 controls the rotary switches 21 andv 22, and will com- .'.iience to step these switches ahead in a sequentii'il order.l Uien the switch 21 is started in operation, the circuit for the stepping magnet 2O will now be completed as follows: from ground and battery, winding of mag net 20, through the switch arm and the contacts of switch 21, and over conductor 5T and through the interrupter 25, to ground. lhen 'the switch arm of switch 22 reaches an arbitrarily chosen one of its contact points such as the contact point connected to conductor 31, the following circuit will be closed: from ground andv battery winding of relay 19, conductor 58, through the switch arm 22,` conductor 31, upper make AContact and armature of relayv 14-5`iesistaiice 29, break contact of relay 13, conductor 59 to the junction point 80, and thence to ground. The closing of this circuit will opera-te the relay 19, which will pull up its armatures and open at its right hand armature and contact the previously traced circuit for thc relay 17, thereby deenergiaing relay 12', and thus discontinuing the application of 1G cycle ringing current to the composite set. The relay 19, by pulling up its left hand armature will open a previously traced circuit for starting the stepping magnet 2() so that the switch arms 2l and 22 after having been returned to their original positions will not be Started in a sebond cycle of operation. it will be seen that with the ro- `tor 31 to different ones of the contacts o't the rotary switch. Should the test man desire to rering over the line, this may be aclll) complished by simply operating the hey K5. rlhis will open the previously traced circuit through the relay 24 and deenergize said relay. ThedeenergiZat-ion of said reJ lay Willreniove ground from the conductor leading te junction point-'30, and thus open the circuits for all of the relays Whose energization depended upon the operation of relay 4. By now closing the key K5 the re- `:lay 24 may again be operated and the sequence oit the ringing operation may be' repeated.

To give the relay 3 al noiroperate test, or in other Words, to test said relay to'see` it v'it is operating lon current oi less than the proper value, the key K2 should be operat- Gdx j through-therch fsl 13 and 14; 'from ground, sleeve cont-acts oiZ jack l, and-plug l1, con- "tact of 'key lg, tip contacts of plug P4 and and contact will close a short circuit about certain of the resistance elements such `as Ri, which are in bridge of the tip and ring conductors of the testing circuit. This decrease in the impedance bridged across the tip and ring conductors will allow less current tobe transmitted to the composite ringer. Accordingly, it the relay 3 now operates it will be operated on current of less than the proper value and will need adjustnient.

To give the relay 4, which, as has been pointed out, isadjusted to operate with cycle current, an operate test, or in other Words, to ascertain it said relay is tunction-` ing Withthe proper amount of current, the keyK...l should be operated. This will close the following circuit: from ground'and bat tery, Winding of relay 11, conductor 59, Winding of relay 15, ring conductor of jack J4, ring contacts of jack J., and plug P4, contact of key'lg, `resistance 29, sleeve con` tacts of plug P4 andjack J4, to ground. The closing of this `circuit -will operate relay 15 `but as the circuit includes the resistance element 29, relay 11, `which is marginal, will not operate at this time. The operation of relay 15 Will close the following circuit from ground and battery,`winding of relay 18, conductor4 60, contact and armature ot relay 15,

2conductor 54, Contact and armature 0f relay Theiollowing circuit is then completedy The relay 19, to junctioirpoint= 39 andthence to ground r 11 nis will operate the relay 1,S-vvliich'will connectthe tip andringconductors of the relay 1S through its lower armature andcon-A tact Willi start the' interrupter`device-28` iir operation. rllhe relay lwill'berlocked up over its ripper armature and' Contact and over conductor (51, resistance 29, break contact of relay 11, conductor 62,' conductor 59v to junction `point 39 and ground. It" is pointed out that this locking circuitA includes a resistance element 29 similar t'o resistance element29, so that' the marginal relay 11 will not be operated upon the closingloit this locking circuit. ln a manner similar t0 the relay 14 the relay` 15 will close' avcircuit over its lower armature and contact to start the rotary switching device' into operation. The ringing current Will then be applied tothe line until the rotary'svvitchQQ reaches the contact point to which thev conductorl 32 is connected; be closed for the relay'19, which, inea manner similar tothatalready pointedout, Will" cause the application ofi-inging current to the composite ringer 'apparatus to be discontinued.

resistanceelements R and vR'1',rand thatnone circuited as relay 11 is not operated. This ringing current is of the propervalu'e toppl verate the relay 4er" the composite ringer 'and the test man may now make observations to see if this relay is functioning With the proper amount of current.

To give the relay 4 a non-operate test the key K, should be thr'o'vvn.- The operation o key K., will close a circuit through relays 11 andv15, which circuit Will not include the resistance element 29 and accordingly both the marginal relay`11 and'therelay 15 Vwill beoperated. The relay`15 will in the same manner as previously pointedout, causev 135 cycle ringing current to be applied t the line for a certain duration. However, the relay 11 will close a short circuit about certain oit' the resistanceelements Rlpin bridge across the tip and ring'conductors of the testingcircuit. Accordingly thiswill reduce theimpedance ini bridge acrossvsaid conductors and a smaller? amount 0f current Will be transmitted to the relay 4 than Would normally `be transmitted thereto under actual operating` conditions. It the relay 4 now operates it vvillbe operatingfon less than the proper current and will need adjustment.

To subject the relays 3 and 4 to operate and At this point1v acircuit will* Itis pointed outl thatV in. the above o erations which take place When the key` la, is `operated that the 135 cycle ringing cur-rent is appliedto theline through the- S of lthe latter' resistance elements are'jshort" ground and battery winding` oi relay l2. tip

conductor of jack J5, tip contacts of jack li, and plug P5, contact of key lo, sleeye contacts of plug P4t and jack J4, to ground. rlhe closing ot this circuit will operate the relay l2.v The operation of the relay l2 will close short circuits about ya greater number of the resistance elements R1, thereby niaterially reducing' the impedance bridged across the testing circuit and accordingly the amount of ringingpcurrent' transmitted to therelays of the composite set will be materially reduced. iter the key KG' has been thus operated, therelays may be tested in the same manner as previouslypointed out, by the operationv of the keys K1, K2, K3 and 4' lt is pointed outin all ot'- `the above mentioned tests that by operating the key K7 the relay 25 may be deenergized and the direct current supply for the direct current relays in the composite ringer set my be removed there'irom, so that the alternating current relays may be subjected to tests while entirely dissociated from the direct current relays. Furthermore, by adjusting the potentiometer 26, the ammeter 27 may be utilized to test the operation of the direct current relays in the composite set. By operating key K9 the current supply through the ammeter 27 to the direct current relays may be varied by the potentiometer :26. ln this manner the direct current relays may be subjected to both operate and nonoperate tests.v

While the invention has been disclosed in certain specific arrangements which have been deemed desirable it is understood that it is capable of embodiment in many other and widely varied forms without departing from the spirit of the invention as defined in the appended claims.

What is claimed is:

l. A. transmission line. a bridge across said line including switching means. composite ringer apparatus including ringing responsive relays associated with said bridge over the contacts of said switching means'.y a testing' apparatus adapted to be associated with said switching means. said testing` apparatus comprisinaa testing circuit including a source oi ringing; current, a plurality of relays and a variable resistance network, and a control circuit including` a plurality ot keys and adapted to be associated with said testingcircuit. said keys controlling said relay means in said testing circuit and said relay means controlling said variable resistance network and the application oi ringing current from said source to'said testing; circuit whereby the amount oi ringing current applied from said testing; circuit to said composite ringer apparatus may be varied.

retransmission line. a bridge across said line including switching; means. composite ringer apparatus including` ringing responsive relays `associated with said bridge over the contactsof said switching means, a testing apparatus adapted to be associated with said switching means, said .testing apparatus comprising` a testing `circuit including a source of ringing` current, a plurality of relays and a i iable resistance network, anda control rcuit including a plurality of keys and'a'daptcd to be associated with said testing circuit, said keys controlling said lrelay rmeans in said testing circuit and said relay means controlling said variable resistance network and the application oi. ringing current `from said source `to said testing circuit whereby the yamountl ot-rintging current applied from said testing circuit to said composite ringer apparatus may be varied, and automatically operatingi means in said testing circuit for controlling the duration ot said application of ringing current from said source to said testingcircuit.

3. A transmission line, a bridge across said line including switching means. composite ringer apparatus including ringing responsive relays associated with said bridge over the contacts of said switching means. testing4 apparatus adapted to be associated with said switching means, said testingapparatus comprising a testing circuit including a source otl ringingv current, a plurality of relays and a variable resistance network,Y and a control circuit including a plurality oi keys and adapted to be associated with said testingA circuit. said keys controlling said relay means in said testing circuit and said relay means controlling said variable resistance network and the application oi ringing' current from said source to said testing circuit whereby the amount of ringingcurrent applied from said testing' circuit to said composite ringer apparatus may be varied, automatically operatingmeans in said testing` circuit controlling the duration of said application oil rinsingcurrent to said testingcircuit, and

`means in said testiner circuit controlled by an additional key in said control circuit for restoringi the apparatus ot said testing' circuit to normal.

4. A transmission line. a bridge across said line including switching means. composite ringer apparatus including ring-,iner responsive relays associated with said bridge over the contacts of said switching' means, and testing apparatus adapted to be associated. with said switching means,

lli

iso

said testing apparatus comprising ya testing ycircuit including a plurality oi sources of ringing current, a plurality of relays,

and a variable resistance network, and a mg current applied from said testing cir cuit to said compositeringer apparatus may be varied.

l5. A transmission line, a bridge across said line including switching means, com- =posite ringer apparatus including alternating ringing responsive relays and direct current relays associated with said bridge over the contacts of said switching means, a testing apparatus adapted to be associated with .saidswitching means, said testing apparatus `comprising, a testing circuit `including a source ofalternating ringing current, a plurality of relays and a Variable resistance network, and a control circuit including `a plurality of keys and adapted to be associated vwith vsaid testing circuit, said keys.

controlling said relay means in said testing circuit and said relay means controlling said Variable resistance network `and the applicationiof alternating ringing current from said source to said testing circuit whereby the current applied from said testing circuit to said alternating ringing responsive relays fin said composite appa- JoHN F. frooMEY.` WILLIAM n. HARRisoN. 

